Neat idea and good music.
Instead of clicking on the button it would have been better to make it an anvil or an enemy. There is no reason why I as a player have to click on it.
There are items I am getting for leveling up and I don't see any visible difference in my gameplay. That is I am still clicking. Generally the design for leveling up is to make the gameplay different by giving some new things since we can only click it does not feel fun leveling up.
why the 3 minutes and 14 seconds time limit? Is there a reason for it?
Good job on your first GWJ and as a solo developer keep up the good work!